Samsung 870 EVO 4000GB

The Samsung 870 EVO 4TB represents the upper theoretical limit of the SATA III interface, utilizing Samsung’s proprietary in-house MKX controller paired with 4GB of Low-Power DDR4 (LPDDR4) SDRAM for address mapping. Internally, the drive employs Samsung’s 6th Generation (V6) 1xx-layer 3-bit MLC (TLC) V-NAND, a configuration designed to optimize endurance and latency within the constraints of the 6Gbps bus. Unlike many modern SATA SSDs that have moved to DRAM-less architectures, the 870 EVO retains a discrete DRAM cache at a standard ratio of 1MB per 1GB of storage, ensuring consistent random I/O performance during sustained workloads. To manage write speeds, the drive utilizes Intelligent TurboWrite, a variable SLC caching buffer that dynamically adjusts based on available capacity to maintain high throughput until the buffer is saturated. Field notes: early production batches of the 2TB and 4TB models (manufactured primarily in early 2021) experienced a notable rate of premature failures characterized by a spike in "0E" (Media and Integrity Errors) counts in SMART data, leading to uncorrectable bad blocks. Samsung released firmware updates (specifically version SVT02B6Q and later) to address underlying NAND voltage management issues; hardware analysts strongly recommend verifying firmware versions on new deployments to prevent potential data degradation.

Key Specifications

• Interface: SATA III (6Gb/s)
• Sequential Read/Write: Up to 560 MB/s / 530 MB/s
• Controller: Samsung MKX (S4LR059)
• NAND Configuration: Samsung 128-Layer V-NAND 3-bit MLC (TLC)
• DRAM Cache: 4GB LPDDR4
• Endurance: 2,400 TBW (Total Bytes Written)
• Security: AES 256-bit Encryption, TCG/Opal 2.0, IEEE1667 (Encrypted Drive) support

Hardware Alternatives

• Crucial MX500: The primary technical rival in the high-performance SATA segment. It utilizes a Silicon Motion SM2258/SM2259 controller paired with Micron TLC NAND. It offers comparable endurance and DRAM-backed performance.
• WD Blue 3D NAND (SanDisk Ultra 3D): A direct performance competitor utilizing Western Digital’s BiCS TLC NAND and a Marvell-based (or proprietary) controller. It targets the same tier of capacity and sustained SATA throughput.
• Samsung 870 QVO: A hardware relative that shares the Samsung MKX controller found in the EVO but substitutes the 3-bit TLC NAND for high-density 4-bit QLC NAND. This results in significantly lower endurance ratings and slower sustained write speeds once the SLC cache is exhausted.